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26650 Li-ion Battery Cells

26650 Li-ion Battery Cells

26650 Li-ion Battery Cells 3.6V 4500mAh with UL certificate Specification of 26 650 Li-ion Battery Cells Mechanism of action Lithium-ion batteries use a carbon material as the negative electrode and a lithium-containing compound as the positive electrode. No lithium metal exists, only lithium...
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26650 Li-ion Battery Cells 3.6V 4500mAh with UL certificate
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 Specification of 26650 Li-ion Battery Cells

No.

Item

Standard

Note

1

Standard Capacity

4500mAh

0.5C,( current value of 4500mA at 1C)

2

Capacity Range

4450~4650mAh

0.5C

3

Standard Voltage

3.6 V


4

Alternating Internal Resistance

≤30mΩ


5

Charge Conditions

Cut-off Voltage

4.2±0.05V

constant-current charge to 4.2V at 0.5C,constant voltage charge to stop until 0.01C mA

Cut-off Current

0.01C

6

Max. Charging Current

4.5A


7

Discharge Cut-off Voltage

2.75V

 

8

Standard Discharge Current

2.25A


9

Fast Discharge Current

4.5A


10

Max. Continuous Discharge Current

13.5A


11

Pulse Discharge Current

15A,5s


12

Cycle Characteristic

1000times(100%DOD)

the residual capacity is no less than 70% of rated capacity at 1C rate.

2000 times(80%DOD)

3000 times(50%DOD)

13

Working Temperature

Charge:0°C~55°C
Discharge:-20°C~60°C


14

Storage Temperature

-20°C ~ 45°C

Short-term storage (< 3 months)

15

Battery Weight

94g (Approx.)



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Mechanism of action
Lithium-ion batteries use a carbon material as the negative electrode and a lithium-containing compound as the positive electrode. No lithium metal exists, only lithium ions. This is a lithium ion battery. A lithium ion battery is a general term for a battery in which a lithium ion intercalation compound is used as a positive electrode material. The charging and discharging process of a lithium ion battery is a process of intercalating and deintercalating lithium ions. In the process of intercalation and deintercalation of lithium ions, it is accompanied by embedding and deintercalation of equivalent electrons with lithium ions (commonly, the positive electrode is represented by embedding or deintercalation, and the negative electrode is represented by insertion or deintercalation). During charge and discharge, lithium ions are intercalated/deintercalated and inserted/deintercalated between the positive and negative electrodes, and are aptly referred to as "rocking chair batteries".
When the battery is charged, lithium ions are generated on the positive electrode of the battery, and the generated lithium ions move to the negative electrode through the electrolyte. The carbon as the negative electrode has a layered structure, and it has many micropores. The lithium ions reaching the negative electrode are embedded in the micropores of the carbon layer, and the more lithium ions are embedded, the higher the charging capacity. Similarly, when the battery is discharged (ie, the process we use the battery), the lithium ions embedded in the carbon layer of the negative electrode come out and move back to the positive electrode. The more lithium ions return to the positive electrode, the higher the discharge capacity.

Ion battery schematic
Generally, the charging current of the lithium battery is set between 0.2C and 1C. The larger the current, the faster the charging and the greater the heat of the battery. Moreover, excessive current charging, the capacity is not full, because the electrochemical reaction inside the battery takes time. Just like pouring beer, if it is too fast, it will produce bubbles, but it will not be full.

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